1 /* Macros to swap the order of bytes in integer values.
2 Copyright (C) 1997,1998,2000,2001,2002,2005 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 #ifndef _PORTABLEXDR_BYTESWAP_H
21 #define _PORTABLEXDR_BYTESWAP_H 1
23 #ifdef HAVE_SYS_PARAM_H
24 #include <sys/param.h>
27 #ifndef __bswap_constant_16
29 /* Swap bytes in 16 bit value. */
30 #define __bswap_constant_16(x) \
31 ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
34 # define __bswap_16(x) \
36 ({ unsigned short int __bsx = (x); __bswap_constant_16 (__bsx); }))
38 static __inline unsigned short int
39 __bswap_16 (unsigned short int __bsx)
41 return __bswap_constant_16 (__bsx);
45 /* Swap bytes in 32 bit value. */
46 #define __bswap_constant_32(x) \
47 ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \
48 (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24))
51 # define __bswap_32(x) \
53 ({ register unsigned int __bsx = (x); __bswap_constant_32 (__bsx); }))
55 static __inline unsigned int
56 __bswap_32 (unsigned int __bsx)
58 return __bswap_constant_32 (__bsx);
62 #if defined __GNUC__ && __GNUC__ >= 2
63 /* Swap bytes in 64 bit value. */
64 # define __bswap_constant_64(x) \
65 ((((x) & 0xff00000000000000ull) >> 56) \
66 | (((x) & 0x00ff000000000000ull) >> 40) \
67 | (((x) & 0x0000ff0000000000ull) >> 24) \
68 | (((x) & 0x000000ff00000000ull) >> 8) \
69 | (((x) & 0x00000000ff000000ull) << 8) \
70 | (((x) & 0x0000000000ff0000ull) << 24) \
71 | (((x) & 0x000000000000ff00ull) << 40) \
72 | (((x) & 0x00000000000000ffull) << 56))
74 # define __bswap_64(x) \
76 ({ union { __extension__ unsigned long long int __ll; \
77 unsigned int __l[2]; } __w, __r; \
78 if (__builtin_constant_p (x)) \
79 __r.__ll = __bswap_constant_64 (x); \
83 __r.__l[0] = __bswap_32 (__w.__l[1]); \
84 __r.__l[1] = __bswap_32 (__w.__l[0]); \
89 /* Copyright (C) 1993,97,2002 Free Software Foundation, Inc.
90 This file is part of the GNU C Library.
92 The GNU C Library is free software; you can redistribute it and/or
93 modify it under the terms of the GNU Lesser General Public
94 License as published by the Free Software Foundation; either
95 version 2.1 of the License, or (at your option) any later version.
97 The GNU C Library is distributed in the hope that it will be useful,
98 but WITHOUT ANY WARRANTY; without even the implied warranty of
99 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
100 Lesser General Public License for more details.
102 You should have received a copy of the GNU Lesser General Public
103 License along with the GNU C Library; if not, write to the Free
104 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
112 static inline uint32_t
116 #if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && defined(LITTLE_ENDIAN)
117 #if BYTE_ORDER == BIG_ENDIAN
119 #elif BYTE_ORDER == LITTLE_ENDIAN
120 return __bswap_32 (x);
122 # error "What kind of system is this?"
125 #error "BYTE_ORDER/BIG_ENDIAN/LITTLE_ENDIAN are not defined"
133 /* Copyright (C) 1993,97,2002 Free Software Foundation, Inc.
134 This file is part of the GNU C Library.
136 The GNU C Library is free software; you can redistribute it and/or
137 modify it under the terms of the GNU Lesser General Public
138 License as published by the Free Software Foundation; either
139 version 2.1 of the License, or (at your option) any later version.
141 The GNU C Library is distributed in the hope that it will be useful,
142 but WITHOUT ANY WARRANTY; without even the implied warranty of
143 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
144 Lesser General Public License for more details.
146 You should have received a copy of the GNU Lesser General Public
147 License along with the GNU C Library; if not, write to the Free
148 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
156 static inline uint16_t
160 #if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && defined(LITTLE_ENDIAN)
161 #if BYTE_ORDER == BIG_ENDIAN
163 #elif BYTE_ORDER == LITTLE_ENDIAN
164 return __bswap_16 (x);
166 # error "What kind of system is this?"
169 #error "BYTE_ORDER/BIG_ENDIAN/LITTLE_ENDIAN are not defined"